foundation.supportingscience, technology,and improved economic performance and financial literacy in the 21st century. >> and with the ongoing support of these institutions and foundations. and... >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> warner: five days and counting with plenty of tit-for- tat charges, but no agreement in sight. that, in short, summed up the state of affairs in washington today as the fiscal cliff deadline loomed, january first. it would mean more than $600 billion in across-the-board tax increases and automatic spending cuts. >> come the first of this year, americans will have less income than they have today. if we go over the cliff, and it looks like that's where we're headed. >> warner: this morning, the senate's democratic majority leader, harry reid, was blunt about chances for a deal. and he blamed house speaker john boehner. just before christmas, boehner floated his so-called "plan b"-- letting taxes rise on millionaires. but faced with opp

. bnsf, the engine that connects us. >> and by the alfred p. sloan foundation.supportingscience, technology,and improved economic performance and financial literacy in the 21st century. >> and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> brown: gunfire tore at the nation's holiday mood again today, with the emotional wounds from a school massacre still fresh. there were more fatal shootings, including one in western new york, where an attacker lay in wait for a fire crew. >> responding firefighters when they pulled up on the scene started receiving -- were fired upon. >> police speaking shortly after a home and car erupted in flames. it was arson they said later that turned out to be an ambush. >> it does appear that it was a trap that was set. for responding first responders. >> gunmen killed two volunteer firefighters and wounded two others then killed himself. police identified him as william sp

look atasciencestorythat captured headlines this year. the federal government has taken new steps to limit some of the research it does with chimpanzees, which have long been the source of hope and debate. but questions remain about whether those experiments should occur under any circumstances. "newshour" science correspondent miles o'brien reports. >> reporter: there are no other animals quite like them, except us. they share 99% of our d.n.a. and it shows. they scheme, plot and fight. they care for their babies and they grieve their dead. and they love a good game of catch. as i discovered, queenie had little patience for my wild pitches. >> did you see her stomp her foot? >> reporter: she's very mad at me. those very similarities are at the core of a heated debate over whether scientists should keep using chimpanzees for scientific and medical research. do we owe our cousins something more? here, they say we do. welcome to chimp haven, near shreveport louisiana, a 200-acre oasis of tall trees and hidden daily treats for about 130 chimpanzees. haven co-founder amy fultz put me

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